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// Copyright 2022 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#if !V8_ENABLE_WEBASSEMBLY
#error This header should only be included if WebAssembly is enabled.
#endif // !V8_ENABLE_WEBASSEMBLY
#ifndef V8_COMPILER_WASM_GC_OPERATOR_REDUCER_H_
#define V8_COMPILER_WASM_GC_OPERATOR_REDUCER_H_
#include "src/compiler/control-path-state.h"
#include "src/compiler/graph-reducer.h"
#include "src/compiler/wasm-graph-assembler.h"
#include "src/wasm/wasm-subtyping.h"
namespace v8 {
namespace internal {
namespace compiler {
class MachineGraph;
struct NodeWithType {
NodeWithType() : node(nullptr), type(wasm::kWasmVoid, nullptr) {}
NodeWithType(Node* node, wasm::TypeInModule type) : node(node), type(type) {}
bool operator==(const NodeWithType& other) const {
return node == other.node && type == other.type;
}
bool operator!=(const NodeWithType& other) const { return !(*this == other); }
bool IsSet() { return node != nullptr; }
Node* node;
wasm::TypeInModule type;
};
// This class optimizes away wasm-gc type checks and casts. Two types of
// information are used:
// - Types already marked on graph nodes.
// - Path-dependent type information that is inferred when a type check is used
// as a branch condition.
class WasmGCOperatorReducer final
: public AdvancedReducerWithControlPathState<NodeWithType,
kMultipleInstances> {
public:
WasmGCOperatorReducer(Editor* editor, Zone* temp_zone_, MachineGraph* mcgraph,
const wasm::WasmModule* module);
const char* reducer_name() const override { return "WasmGCOperatorReducer"; }
Reduction Reduce(Node* node) final;
private:
using ControlPathTypes = ControlPathState<NodeWithType, kMultipleInstances>;
Reduction ReduceWasmStructOperation(Node* node);
Reduction ReduceWasmArrayLength(Node* node);
Reduction ReduceAssertNotNull(Node* node);
Reduction ReduceCheckNull(Node* node);
Reduction ReduceWasmTypeCheck(Node* node);
Reduction ReduceWasmTypeCast(Node* node);
Reduction ReduceWasmExternInternalize(Node* node);
Reduction ReduceMerge(Node* node);
Reduction ReduceIf(Node* node, bool condition);
Reduction ReduceStart(Node* node);
Node* SetType(Node* node, wasm::ValueType type);
// Returns the intersection of the type marked on {object} and the type
// information about object tracked on {control}'s control path (if present).
wasm::TypeInModule ObjectTypeFromContext(Node* object, Node* control);
Reduction UpdateNodeAndAliasesTypes(Node* state_owner,
ControlPathTypes parent_state, Node* node,
wasm::TypeInModule type,
bool in_new_block);
Graph* graph() { return mcgraph_->graph(); }
CommonOperatorBuilder* common() { return mcgraph_->common(); }
SimplifiedOperatorBuilder* simplified() { return gasm_.simplified(); }
MachineGraph* mcgraph_;
WasmGraphAssembler gasm_;
const wasm::WasmModule* module_;
};
} // namespace compiler
} // namespace internal
} // namespace v8
#endif // V8_COMPILER_WASM_GC_OPERATOR_REDUCER_H_
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